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2.213.6+4.317.3+470.12=12.213+12.317+470.12
=12(213+317+470)=12.1000=12000
![](https://rs.olm.vn/images/avt/0.png?1311)
2.213.6+4.317.3+470.12
2.6.213+4.3.317+470.12
12.213+12.317+470.12
12(213+317+470)
12.1000
12000
2 . 213.6 + 4 . 317.3 + 470 . 12
= 12 . 213 + 12.317 + 470 . 12
= 12 (213 + 317 + 470)
= 12 . 1000
= 12000
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3x+2x=35\)
\(\Rightarrow x\cdot\left(3+2\right)=35\)
\(\Rightarrow x\cdot5=35\)
\(\Rightarrow x=35:5\)
\(\Rightarrow x=7\)
Vậy: x = 7
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2x-5=(-17)+12
2x-5=-5
2x=-5+5
x=0:2
x=0
\(2x-5=(-17)+12\)
\(2x=(-17)+12+5\)
\(2x=0\)
\(x=0\)
Vậy \(x=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5^{x+2}-5^x=3.10^3\)
\(\Rightarrow5^x\left(5^2-1\right)=3000\)
\(\Rightarrow5^x.24=3000\Rightarrow5^x=125=5^3\)
\(\Rightarrow x=3\)
\(5^{x+2}-5^x=3\cdot10^3\)
\(\Leftrightarrow5^x\cdot24=3000\)
\(\Leftrightarrow x=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=(2.17.6)+(4.313.3)+(470.12)
=(12.17)+(12.313)+(470.12)
=12.(17+313+470)
=12.800
=9600
Ung hộ = cách tích đúng cho mk nha
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2.213.6 + 4.317.3 + 470.12 = 12000